Metallic alloy



Patented June 30, 1925.

UNITED BERT MACE HUFF, 0F DETROIT, MICHIGAN, ASSIGNOE 0F ONE-THIRD TOIHAROLD A. ARNOLD, 0E DETROIT, MICHIGAN, AND ONE-THIRD T0 MAURICE E.FITZGERALD,

0F PONTIAC, MICHIGAN.

METALLIC ALLOY.

No Drawing.

To all whom it may concern:

Be it known that I, Bnn'r MACE HUFF, a citizen of the United States ofAmerica, residing atDetroit, in the county of Wayne and State ofMichigan, have invented cer tain new and useful Improvements in MetallicAlloys, of which the following is a specification.

The invention relates to metallic alloys and more particularly to anon-ferrous type suitable for the manufacture of cutting tools. Theobject of the invention is to produce an alloy having great hardness andtoughness, one that will not be susceptible to ready oxidation and thatmay be welded and will have other desirable properties for use as acutting tool.

The principal ingredients of my new alloy are cobalt, chromium andtungsten and, while these elements have heretofore been used in themanufacture of non-ferrous cutting alloys, I have found that by properlyproportioning the percentages of these ele-- ments and adding theretocertain amounts of other elements it is possible to obtain a cuttingalloy having qualities superior to any of the commercial alloys of thisgeneral nature. Amongst the elements which may be added to cobalt,chromium and tungsten to produce a better alloy are manganese andsilicon and these are preferably present to the amount of about onepercent each.

As a typical example of my improved alloy the following completeanalysis is submitted:'

Per cent.

Cobalt 45. 72

Uh i gage by these percentages except as denoted in T t 12 2 theappended claims Iron 4.14:

C b 2 37 Minimum Maximum I l C halt Perze'nt Per centmoreIIIIIIIIIZIIIIIIIIIIIIIIIIII e197 ggggliiiiii:33333333333333: 3

Calcium 0. 34 g E100 Magnesium 08 M =infiI"""IIIIIIIIIIIIIIIIIIIIIIII11% 1.23

Phosphorus 0.04 8mm L00 t l 99.45 The carbon in the alloy may beintroabove analysis, it is preferableto use rela- Application filedJanuary 28, 1924. Serial N0.G89,M9.

tively pure materials, the chromium and tungsten being ninety-fivepercent (95%) pure and the cobalt ninety percent (90%) pure. It is alsopreferable to introduce the manganese and silicon by adding to the abovemetals the proper proportions of man ganese and silicon, eachapproximately ninety percent (90%) pure. It is also desirable tointroduce a small amount of iron into the mixture, preferably in theform of malleable or Norway iron. The materials are mixed in the desiredproportions and melted, preferably in an electric arc furnace under atemperature of approximately 2800 degrees Fahrenheit, and whenthoroughly molten the alloy is cast into chills. The resulting productis found to be exceedingly hard, tough, non-magnetic, and weldable, 'andcannot be machined by ordinary methods.

While the above analysis has been given to show a typical alloyembodying my invention, I wish it understood that I do not restrictmyself to the exact percentages mentioned therein for it is obvious thatsome limits of my preferred composition, al-

though I wish it understood that I do not regard myself as beingnecessarily limited duced combined with the other materials, such, forinstance, as the malleable iron and it is sometimes also introduced byabsorption from the crucible or the carbon electrodes of the arcfurnace.

What I claim as my invention is 1. A metallic alloy containing as theprincipal ingredient substantial amounts of cobalt, chromium andtungsten totaling not less than 70% together with relatively smallamounts of manganese and silicon, the cobalt not exceeding 50%, thechromium not exceeding and the tungsten not exceeding 15%.

2. A metallic alloy containing cobalt from to chromium from 25% to 35%,tungsten from 5% to 15% together with small amounts of manganese andsilicon.

3. A metallic alloy containing cobalt from 40% to 50%, chromium from 25%to 35%, tungsten from 5% to 15%, carbon from 1% to 4%, manganese from 1%to 1 and silicon from 1% to 5%.

4. A metallic alloy containing cobalt, approximately forty-six percent(46%), chromium, approximately thirty-one percent (31%), tungsten,approximately thirteen percent (13%), together with small amounts ofiron, manganese and silicon.

5. A metallic alloy containing cobalt, approximately forty-six percent(46%), chromium approximately thirty-one percent (31%), tungsten,approximately thirteen percent (13%), together with small amounts ofiron, manganese, silicon and carbon.

6; A metallic alloy containing cobalt, approximately forty-six percent(46%), chromium, approximately thirty-one percent (31%), tungsten,approximately thirteen percent (18%), iron, approximately four percent(4%), carbon, approximately two and five-tenths percent (2.5%),manganese, approximately one percent (1%), 52nd )silicon, approximatelyone percent 7. A metallic alloy consisting of the ingredients in theproportions substantially In testimony whereof I affix my signature.

BERT MACE HUFF.

